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JAVA_EXPLOIT.OC

October 09, 2012
 Analysis by: Jasen Sumalapao
 ALIASES:

Exploit:Java/CVE-2012-1723.P (Microsoft), Trojan.Maljava!gen23 (Symantec), Java/Blacole.C (Authentium), Troj/JavaDl-NZ (Sophos), EXP/JAVA.Ivinest.Gen (Antivir), Exploit.Java.CVE-2012 (Ikarus), Java/Blacole.C (exact) (Fprot), a variant of Java/Exploit.CVE-2012-1723.B trojan (NOD32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Trojan may arrive bundled with malware packages as a malware component. It may be hosted on a website and run when a user accesses the said website.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

6,923 bytes

File Type:

Java, Java Class

Memory Resident:

No

Initial Samples Received Date:

22 Aug 2012

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be hosted on a website and run when a user accesses the said website.

It may be downloaded from the following remote sites:

  • http://{BLOCKED}u-tokyo.{BLOCKED}u.com/_vti_cof/senkaku.htm

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}u-tokyo.25u.com/_vti_cof/tokyo.jpg

It takes advantage of the following software vulnerabilities to download possibly malicious files:

  • CVE-2012-0507
  • CVE-2012-1723

It saves the files it downloads using the following names:

  • %User Temp%\sidebar.exe - detected as BKDR_ETUMBOT.AG

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

NOTES:
It may arrive on a system by clicking malicious links in spammed email messages.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.344.02

FIRST VSAPI PATTERN DATE:

23 Aug 2012

VSAPI OPR PATTERN File:

9.345.00

VSAPI OPR PATTERN Date:

24 Aug 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware/grayware files dropped/downloaded by JAVA_EXPLOIT.OC

    • BKDR_ETUMBOT.AG

Step 3

Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPLOIT.OC. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 4

Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

  • http://www.oracle.com/technetwork/topics/security/javacpufeb2012-366318.html
  • http://www.oracle.com/technetwork/topics/security/javacpujun2012-1515912.html


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